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Lesson 4.1

Galaxy & Stars

TermDefinition
What is the universe made up of? Matter, Energy, Empty Space
Universe Informally means 'Everything' in our world
Observable universe everythings existance we've been able to confirm thus far / observe
How old is the universe? About 13.8 billion years old
Galaxy Stars, Gas, Dust, all held together by Gravity
About how many starts does the milky way have? More than 100 billion stars
Elliptical galaxies Round / Oval shaped, Do not create stars
Spiral galaxies curved arms that reach out from the centre, Create stars
Irregular galaxies Galaxies that don't fit into these two groups
Which type of galaxies create stars Spiral galaxies
Milky Way Contains a bar in the middle instead of a central bulge, and has supermasive black hole
In which type of galaxies will you often find very old stars? Elliptical galaxies
AU / Astronomical unit Average distance from the earth to the sun ( about 150km )
Light Year The distance light travels through space in one year
What is a light year? The light-year is NOT a measurement of time; it's the distance that a beam of light travels in one year.
interplanetary distances are the distances between planets measured in (Km and AU)
Interstellar distances are distances between the stars in a galaxy. These distances are measured in light-years.
Intergalactic distance are the distances between galaxies and are also measured in light-years.
Constellation Groups of stars that form a pattern
Comet A ball of rock and ice
asteriod Balls of rocks that orbit the sun
solar system contains the sun, moons, planets
planet a small rocky body that orbits the sun
moon a large body that orbits a planet
nebula a cloud of dust and gases
Created by: Lily Ibrahim
Popular Earth Science sets

 

 



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